Question

How many joules are there in one watt-hour?

Answer 1

Concept used: Electrical energy

Prerequisite: Knowledge of units of electrical energy

Definition of Watt-Hour:

A definite amount of electrical energy is measured in Joule, whereas if the use of the electrical energy varies with time, then it is measured in watt-hour. The conversion of watt-hour can be done by converting Watt into Joule per second and hour into second.

The amount of Joules present in one watt-hour can be calculated as,

$$\begin{gathered} 1\mathrm{watt}-\mathrm{hour}=1\text{watt×}60\times 60\text{seconds} \\ 1\mathrm{watt}-\mathrm{hour}=3600\mathrm{Joules} \end{gathered}$$

Thus, there are 3600 Joules in one watt-hour.